Whip stock



F. KINZBACH May 16, 1939.

WHIP STOCK Filed Aug. 6, 1937 iii Patented May 16, 1939 UNITED STATES- PATENT OFFICE WHIP STOCK Frank Kimbach, Houston, Tc

Application August 6, 1937, Serial No. 157,638

Claims.

This invention relates to a whip stock.

I The invention also comprehends a novel methiod of perforating a pipe'in a well bore.

As is well known to those familiar with the art of well drilling the well sometimes becomes obstructed so that drilling can not proceed in the original bore. Also it often happens that the well bore becomes deflected and must be side tracked at or near the point of deflection to straighten the bore. In either of such events it is common practice to lower a deflector, commonly known as a whip stock, into the casing and to anchor the whip stock at a point where it is desired to begin side tracking and to then mill out the side of the casing opposite the whip stock to provide a vertically elongated opening or window through the casing through which the drill and drill stem may work in order to side track the lower end of the original bore and to proceed with drilling along side the side tracked bore.-

It is an object of the invention to provide a novel type of whip stock whereby a long, well deflned window or opening may be cut through the casing by the milling tool to give abundant room for the passage of the drill and drill stem through said opening during the succeeding drilling operations.

It is a further object of the invention to provide a whip sto'ck having a sloping deflecting face a for deflecting the milling tool to form the initial perforation through the casing wall with a supplemental deflector shaped to be lowered into the casing and seated against the whip stock proper and thereby anchored against downward movement as well as against rotation while the milling tool is being used to complete the perforation.

It is another object of the invention to disclose a novel method of perforating a casing set in a well bore.

With the above and other objects in view the invention has particular relation to certain novel features of construction, arrangement of parts and use, as well as to a novel method, an example of which is given in this specification and illustrated in the accompanying drawing, where- Figure 1 shows a fragmentary vertical sectional view of a well casing, showing the whip stock and milling tool therein in position for performing the initial perforation.

Figure 2 shows a fragmentary vertical sectional view of the well casing showing the whip stock and the supplemental deflector mounted therein with the milling tool in position for completing the work.

Figure 3 shows an elevational view of the well casing showing the side opening or window formed therein.

Figure 4 shows a cross sectional view taken on the line 4-4 of Figure 1.

Figure 5 shows a cross sectional view taken on the line 5-5 of Figure 1, and

Figure 6 shows a cross sectional view taken on 10 the line 6-8 of Figure 2.

Referring now more particularly to the drawing wherein like numerals of reference designate similar parts in each of the Figures, the numeral I designates the well casing to be perforated. The numeral 2 designates the whip stock proper which may be lowered into the casing and anchored in any conventional manner well known to those familiar with the art of side tracking. The whip stock 2 is of special formation, its lower end being preferably cylindrical to substantially flt within the casing l and its upper end having an arcuate tapering deflecting face 3. Beneath the face 3 the whip stock has a substantially vertical face I provided with a vertical groove 5 which is preferably V-shaped and the lower end of the face 4 merges with the downwardly and outwardly declining face 6.

When the ship stock 2 is set in the casing a milling tool I of any conventional construction may be attached to the lower end of the operating stem 8 and lowered into the casing. The milling tool will be deflected by the face 3 into contact with the opposite side of the casing and as the milling tool is rotated it will gradually cut an elongated opening 8 through the side wall of the casing and this operation is continued until the milling tool reaches the lower end of the deflecting face 3.

Thereupon the drilling tool is withdrawn from the well and a supplemental deflector I0 is lowered. The lower end of this supplemental deflector is formed with the tapering face ll shaped to flt closely against the face 6 and to seat thereon so as to wedge tightly between the face 6 and the casing I. The rear side of the deflector I0 is shaped to flt closely against the forward face of the whip stock proper and has a vertical rib l2 which fits closely into the groove 5. Above the whip stock 2 the rear side of the supplemental deflector is shaped to flt against the casing l and said supplemental deflector is formed with an arcuate deflecting face IS on its forward side. The supplemental deflector will be thereby an- 55 chored securely in position on the whip stock proper. The milling tool may then again be lowered and when it comes into contact with the deflecting face II it will be deflected against the 5 side wall of the casing above the opening 9 and when rotated will form an upper perforation it through the casing. The milling operation may be continued and as the milling tool is lowered, said upper opening I! will be elongated downwardly until it merges into the opening 9. A long well defined opening or window will thus be cut through the casing and when the milling tool has been withdrawn drilling may he proceeded with through said opening. 5 The drawing and description disclose what is now considered to be a preferred form of the invention by way of illustration only, while the broad principle of the invention will be defined by the appended claims. What I claim is: 1. A milling'tool deflector adapted to be set in a well pipe and whoseupper end is formed with a tapered deflecting face extending downwardly n-om its upper end and whose intermediate por- 35 tion is formed with an approximately vertical face having a vertical groove therein, said deflector having a downwardly and outwardly declining face beneath the vertical face.

2. A milling tool deflector comprising a whip .0 stock adapted to be set in a pipe in a well and whose upper end is formed with a deflecting face, a supplemental deflector adapted to be seated against said face in the pipe and whose upper end is formed with a deflecting face parallel with the face of the whip stock, said whip stock and supplemental deflector being provided one with an approximately vertical groove and the other with a rib arranged to seat in said groove.

3. A milling tool deflector comprisinga whip stock adapted to be set in a pipe in a well and having a tapering deflecting face at its upper end, a supplemental deflector adapted to seat against said face and whose upper end is formed with a tapering deflecting face spaced from and parallel with the flrst mentioned face.

4. A milling tool deflector comprising a whip stock adapted to be set in a pipe in a well and having a tapering deflecting face at its upper end,

a supplemental deflector adapted to seat against end downwardly, a supplemental deflector whose rear side is shaped to fit closely against the forward'side of the whip stock and whose upper end is formed with a tapering deflecting face, the tapering deflecting face of the supplemental deflector being approximately parallel with and spaced forwardly from the corresponding tapering face of the whip stock.

FRANK KINZBACH. 

